Question

I have 2 important classes(client and server) and I will write something in my text area and by clicking on the send button I will call the active method of the client class and I will send that text to my client class,every thing is ok and that text also will be printed on the server console but I can not echo that text from server to client,please help me thanks.

client class:( a part of that)

 os = new PrintWriter(c.getOutputStream(), true);


 is = new BufferedReader(new InputStreamReader(c.getInputStream()));

 public static void active() {

 String teXt = MainClient.getText();

 os.println(teXt);

 String line = is.readLine();
        System.out.println("Text received: " + line);
        os.flush();
        is.close();
        is.close();
        c.close();

server class:( a part of that)

      BufferedReader streamIn = new BufferedReader(new InputStreamReader(client.getInputStream()));
        PrintWriter streamOut =new PrintWriter(client.getOutputStream());
        boolean done = false;
        String line =null;
        while (!done ) {

            line = streamIn.readLine();
            if (line.equalsIgnoreCase("bye")) {
                done = true;
            } else {
                System.out.println(line);
                streamOut.println(line);
            }
        }

        streamIn.close();
        client.close();
        server.close();

Answer 1

actually Nettogrof is going the correct way, but you must also flush the server side:

        line = streamIn.readLine();
        if (line.equalsIgnoreCase("bye")) {
            done = true;
        } else {
            System.out.println(line);
            streamOut.println(line);
            streamOut.flush();    // or ...checkError();
        }

or just create the PrintWriter with autoFlush set to true:

    PrintWriter streamOut = new PrintWriter(client.getOutputStream(), true);

One note: you should also test if readLine() is returning null since the client will close the connection without sending a “bye”.

A second note: instances of PrintWriter never throw IOExceptions, you should test for errors calling checkError(), which also flushes the stream.